at Orchard.WarmupStarter.Starter1.OnBeginRequest(HttpApplication application)

Object reference not set to an instance of an object.
at Orchard.Environment.Extensions.Loaders.PrecompiledExtensionLoader.<IsCompatibleWithModuleReferences>b__1e(ExtensionProbeEntry r)
at System.Linq.Enumerable.All[TSource](IEnumerable1 source, Func2 predicate)
at Orchard.Environment.Extensions.Loaders.PrecompiledExtensionLoader._IsCompatibleWithModuleReferences_(ExtensionDescriptor extension, IEnumerable1 references)
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable1 source, Func2 predicate)
at Orchard.Environment.Extensions.ExtensionLoaderCoordinator.ProcessExtension(ExtensionLoadingContext context, ExtensionDescriptor extension)
at Orchard.Environment.Extensions.ExtensionLoaderCoordinator.SetupExtensions()
at Orchard.Environment.DefaultOrchardHost.BuildCurrent()
at Orchard.Environment.DefaultOrchardHost.Orchard.Environment.IOrchardHost.Initialize()
at Orchard.Web.MvcApplication.HostInitialization(HttpApplication application)
at Orchard.WarmupStarter.Starter`1.<>c__DisplayClass3.<LaunchStartupThread>b__2(Object state)